Table 2.
Comparison of transmission rates for all households and household contacts, and for Alpha variant versus non-VOC viruses.
| Households a with Transmission | % with Transmission, 95% CI | PCR+ (n)/(N) |
p-Value b | Crude OR, 95% CI |
p-Value | ||
|---|---|---|---|---|---|---|---|
| All variants | 60.0 (47.4–71.4) | 39/65 | |||||
| Non-VOC viruses |
55.0 (39.8–70.1) | 22/40 | 1 (Ref) | ||||
| Alpha variant |
83.3 (55.9–95.2) | 15/18 | 0.04 | 4.24 (0–4.2 × 1032) | 0.04 | ||
| Household Contact c |
SAR %,
95% CI |
PCR+
(n)/(N) |
p-Value b |
Crude OR,
95% CI |
p-Value |
Adjusted OR d,
95% CI |
p-Value |
| All variants | 49.6 (37.8–61.5) | 67/135 | |||||
| Non-VOC viruses |
42.5 (28.7–57.7) | 37/87 | 1 (Ref) | 1 (Ref) | |||
| Alpha variant |
77.8 (49.4–92.6) | 28/36 | 0.02 | 65.7 (1.74–2481) | 0.02 | 468 (1.8–1.2 × 105) |
0.03 |
a including 65 households for all variants, and 18 households with Alpha variant, and 40 households with non-VOC viruses. b comparison of Alpha variant with non-VOC viruses. Pearson chi2 test statistics was corrected with the second-order correction of Rao and Scott and converted into an F statistic. c households with at least one confirmed case among its household contacts. d adjusted for the age and sex of the primary case and household contacts, and household size (number of persons per household). PCR+, PCR positive. p-Values < 0.05 are shown in bold.